There we go, theres the magic words I was looking for.
Now you'll find me to be much more agreeable, me offering info to try and help you and then being told I'm wrong is pretty annoying.
Yea you're right the cards are pretty different but not so much as that you can't compare them at all. The phases are the biggest difference in my mind, the cooling plates are quite similar IMO. Anyway yes you can't directly compare my number to what you might see, but my VRM temps at 1.12v are about 10C cooler than my core temps. So while this is just a guesstimate I wouldn't expect the 570 PE/OC TFIII's VRMs to be considerably hotter than it's core, I would guess they would be pretty close to the core temp at reasonable fan speeds (large increases in fan speed would of course cool the core more than the VRMs).
If you're wondering MSI AB does report the VRM and memory temps for 580 Lightnings, so that's where I'm getting my numbers.